The first half of 2018 brought significant challenges for global supply chains ranging from shifting trade policy to rising costs. The second half of the year won’t be any quieter. The most pressing issue is the emerging tariff battle between the U.S. and China which could inflict duties on at least $300 billion of trade by year end. China is also trying to close the RCEP trade deal while the U.K. struggles with Brexit terms and sanctions against North Korea, Iran and Venezuela continue. The container-lines are facing a decline in profits, while the ports may have to contend with tech...